According to the document referenced below the MicroVAX Diagnostic
Monitor, Version 5.0, Release 139 was available a CD-ROM media, where
QZ-K32AA-H8 was the order number of the CD-ROM media kit.

So the question is, does anyone happen to have a copy of that MDM
CD-ROM? Or any versions of MDM on CD-ROM?
MicroVAX Diagnostic Monitor Release Notes
Order Number: AA-PK29E-TE
These release notes describe restrictions, undocumented features, and
other essential information about the MicroVAX Diagnostic Monitor (MDM)
Version 5.0, Release 139. These release notes supersede all other MDM
documentation.
http://manx-docs.org/collections/mds-199909/cd1/vax/pk29ete.pdf